So, it turns out that there are a couple of theories as to how external compressions make the blood go around;
http://pulmccm.org/main/2015/review-articles/icu-physiology-1000-words-cardiopulmonary-resuscitation
So, it turns out that there are a couple of theories as to how external compressions make the blood go around;
http://pulmccm.org/main/2015/review-articles/icu-physiology-1000-words-cardiopulmonary-resuscitation